The server, known as VUUM, can handle all popular message formats for all message modes (text, audio, still images and moving images).

FORBES: Magazine Article

Many firms handle the problem by ensuring that a recorded message automatically plays when this situation arises but Ofcom rules decree that this system - known as "abandoned calls" - should not be used in more than 3% of all calls made in any 24-hour period.

BBC: NEWS | UK | 'Silent calls' warning welcomed

The city of Fairfield, which has three affected train stations, sent out a message telling commuters there will not be enough extra buses to handle normal passenger volume on Monday.

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He is not going to go off-message without a lot of discussion inside the campaign on how they wanted to handle it, " said Norm Ornstein, a veteran political analyst and author of "It's Even Worse Than It Looks: How the American Constitutional System Collided with the New Politics of Extremism.

CNN: Fehrnstrom's sharp quips, elbows help Romney